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          请求取消模块单元测试
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          (adsbygoogle = window.adsbygoogle || []).push({});
      </script></div> <div class="theme-vdoing-content content__default"><h1 id="请求取消模块单元测试"><a href="#请求取消模块单元测试" class="header-anchor">#</a> 请求取消模块单元测试</h1> <p>请求取消模块是 <code>ts-axios</code> 库核心流程其中一个分支，也是非常重要的模块，我们将从基础库和业务流程模块 2 个方面去编写单元测试。</p> <h2 id="cancel-类单元测试"><a href="#cancel-类单元测试" class="header-anchor">#</a> Cancel 类单元测试</h2> <p><code>cancel/Cancel.spec.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> Cancel<span class="token punctuation">,</span> <span class="token punctuation">{</span> isCancel <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'../../src/cancel/Cancel'</span>

<span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'cancel:Cancel'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should returns correct result when message is specified'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">const</span> cancel <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Cancel</span><span class="token punctuation">(</span><span class="token string">'Operation has been canceled.'</span><span class="token punctuation">)</span>
    <span class="token function">expect</span><span class="token punctuation">(</span>cancel<span class="token punctuation">.</span>message<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'Operation has been canceled.'</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should returns true if value is a Cancel'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isCancel</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">Cancel</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeTruthy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should returns false if value is not a Cancel'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">expect</span><span class="token punctuation">(</span><span class="token function">isCancel</span><span class="token punctuation">(</span><span class="token punctuation">{</span> foo<span class="token operator">:</span> <span class="token string">'bar'</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeFalsy</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br></div></div><h2 id="canceltoken-类单元测试"><a href="#canceltoken-类单元测试" class="header-anchor">#</a> CancelToken 类单元测试</h2> <p><code>cancel/CancelToken.spec.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> CancelToken <span class="token keyword">from</span> <span class="token string">'../../src/cancel/CancelToken'</span>
<span class="token keyword">import</span> Cancel <span class="token keyword">from</span> <span class="token string">'../../src/cancel/Cancel'</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> Canceler <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'../../src/types'</span>

<span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'CancelToken'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'reason'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should returns a Cancel if cancellation has been requested'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">let</span> cancel<span class="token operator">:</span> Canceler
      <span class="token keyword">let</span> token <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">CancelToken</span><span class="token punctuation">(</span>c <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        cancel <span class="token operator">=</span> c
      <span class="token punctuation">}</span><span class="token punctuation">)</span>
      cancel<span class="token operator">!</span><span class="token punctuation">(</span><span class="token string">'Operation has been canceled.'</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>token<span class="token punctuation">.</span>reason<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span>expect<span class="token punctuation">.</span><span class="token function">any</span><span class="token punctuation">(</span>Cancel<span class="token punctuation">)</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>token<span class="token punctuation">.</span>reason<span class="token operator">!</span><span class="token punctuation">.</span>message<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'Operation has been canceled.'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should has no side effect if call cancellation for multi times'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">let</span> cancel<span class="token operator">:</span> Canceler
      <span class="token keyword">let</span> token <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">CancelToken</span><span class="token punctuation">(</span>c <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        cancel <span class="token operator">=</span> c
      <span class="token punctuation">}</span><span class="token punctuation">)</span>
      cancel<span class="token operator">!</span><span class="token punctuation">(</span><span class="token string">'Operation has been canceled.'</span><span class="token punctuation">)</span>
      cancel<span class="token operator">!</span><span class="token punctuation">(</span><span class="token string">'Operation has been canceled.'</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>token<span class="token punctuation">.</span>reason<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span>expect<span class="token punctuation">.</span><span class="token function">any</span><span class="token punctuation">(</span>Cancel<span class="token punctuation">)</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>token<span class="token punctuation">.</span>reason<span class="token operator">!</span><span class="token punctuation">.</span>message<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'Operation has been canceled.'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should returns undefined if cancellation has not been requested'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> token <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">CancelToken</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        <span class="token comment">// do nothing</span>
      <span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>token<span class="token punctuation">.</span>reason<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeUndefined</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'promise'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should returns a Promise that resolves when cancellation is requested'</span><span class="token punctuation">,</span> done <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">let</span> cancel<span class="token operator">:</span> Canceler
      <span class="token keyword">const</span> token <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">CancelToken</span><span class="token punctuation">(</span>c <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        cancel <span class="token operator">=</span> c
      <span class="token punctuation">}</span><span class="token punctuation">)</span>
      token<span class="token punctuation">.</span>promise<span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span>value <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        <span class="token function">expect</span><span class="token punctuation">(</span>value<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span>expect<span class="token punctuation">.</span><span class="token function">any</span><span class="token punctuation">(</span>Cancel<span class="token punctuation">)</span><span class="token punctuation">)</span>
        <span class="token function">expect</span><span class="token punctuation">(</span>value<span class="token punctuation">.</span>message<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'Operation has been canceled.'</span><span class="token punctuation">)</span>
        <span class="token function">done</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span><span class="token punctuation">)</span>
      cancel<span class="token operator">!</span><span class="token punctuation">(</span><span class="token string">'Operation has been canceled.'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'throwIfRequested'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should throws if cancellation has been requested'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">let</span> cancel<span class="token operator">:</span> Canceler
      <span class="token keyword">const</span> token <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">CancelToken</span><span class="token punctuation">(</span>c <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        cancel <span class="token operator">=</span> c
      <span class="token punctuation">}</span><span class="token punctuation">)</span>
      cancel<span class="token operator">!</span><span class="token punctuation">(</span><span class="token string">'Operation has been canceled.'</span><span class="token punctuation">)</span>
      <span class="token keyword">try</span> <span class="token punctuation">{</span>
        token<span class="token punctuation">.</span><span class="token function">throwIfRequested</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
        <span class="token function">fail</span><span class="token punctuation">(</span><span class="token string">'Expected throwIfRequested to throw.'</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span>thrown<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span><span class="token punctuation">(</span>thrown <span class="token keyword">instanceof</span> <span class="token class-name">Cancel</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
          <span class="token function">fail</span><span class="token punctuation">(</span><span class="token string">'Expected throwIfRequested to throw a Cancel, but test threw '</span> <span class="token operator">+</span> thrown <span class="token operator">+</span> <span class="token string">'.'</span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span>
        <span class="token function">expect</span><span class="token punctuation">(</span>thrown<span class="token punctuation">.</span>message<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'Operation has been canceled.'</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should does not throw if cancellation has not been requested'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> token <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">CancelToken</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        <span class="token comment">// do nothing</span>
      <span class="token punctuation">}</span><span class="token punctuation">)</span>
      token<span class="token punctuation">.</span><span class="token function">throwIfRequested</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'source'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should returns an object containing token and cancel function'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> source <span class="token operator">=</span> CancelToken<span class="token punctuation">.</span><span class="token function">source</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>source<span class="token punctuation">.</span>token<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span>expect<span class="token punctuation">.</span><span class="token function">any</span><span class="token punctuation">(</span>CancelToken<span class="token punctuation">)</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>source<span class="token punctuation">.</span>cancel<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span>expect<span class="token punctuation">.</span><span class="token function">any</span><span class="token punctuation">(</span><span class="token builtin">Function</span><span class="token punctuation">)</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>source<span class="token punctuation">.</span>token<span class="token punctuation">.</span>reason<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBeUndefined</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      source<span class="token punctuation">.</span><span class="token function">cancel</span><span class="token punctuation">(</span><span class="token string">'Operation has been canceled.'</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>source<span class="token punctuation">.</span>token<span class="token punctuation">.</span>reason<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span>expect<span class="token punctuation">.</span><span class="token function">any</span><span class="token punctuation">(</span>Cancel<span class="token punctuation">)</span><span class="token punctuation">)</span>
      <span class="token function">expect</span><span class="token punctuation">(</span>source<span class="token punctuation">.</span>token<span class="token punctuation">.</span>reason<span class="token operator">!</span><span class="token punctuation">.</span>message<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'Operation has been canceled.'</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br><span class="line-number">67</span><br><span class="line-number">68</span><br><span class="line-number">69</span><br><span class="line-number">70</span><br><span class="line-number">71</span><br><span class="line-number">72</span><br><span class="line-number">73</span><br><span class="line-number">74</span><br><span class="line-number">75</span><br><span class="line-number">76</span><br><span class="line-number">77</span><br><span class="line-number">78</span><br><span class="line-number">79</span><br><span class="line-number">80</span><br><span class="line-number">81</span><br><span class="line-number">82</span><br><span class="line-number">83</span><br><span class="line-number">84</span><br><span class="line-number">85</span><br><span class="line-number">86</span><br><span class="line-number">87</span><br><span class="line-number">88</span><br></div></div><p>注意，这里我们使用了 <code>fail</code> 函数表示一个测试的失败，这个并未在 Jest 文档中体现，但它是一个可以用的 API。</p> <h2 id="cancel-业务逻辑单元测试"><a href="#cancel-业务逻辑单元测试" class="header-anchor">#</a> Cancel 业务逻辑单元测试</h2> <p><code>cancel.spec.ts</code>：</p> <div class="language-typescript line-numbers-mode"><pre class="language-typescript"><code><span class="token keyword">import</span> axios <span class="token keyword">from</span> <span class="token string">'../src/index'</span>
<span class="token keyword">import</span> <span class="token punctuation">{</span> getAjaxRequest <span class="token punctuation">}</span> <span class="token keyword">from</span> <span class="token string">'./helper'</span>

<span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'cancel'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
  <span class="token keyword">const</span> CancelToken <span class="token operator">=</span> axios<span class="token punctuation">.</span>CancelToken
  <span class="token keyword">const</span> Cancel <span class="token operator">=</span> axios<span class="token punctuation">.</span>Cancel

  <span class="token function">beforeEach</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    jasmine<span class="token punctuation">.</span>Ajax<span class="token punctuation">.</span><span class="token function">install</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token function">afterEach</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    jasmine<span class="token punctuation">.</span>Ajax<span class="token punctuation">.</span><span class="token function">uninstall</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'when called before sending request'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should rejects Promise with a Cancel object'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> source <span class="token operator">=</span> CancelToken<span class="token punctuation">.</span><span class="token function">source</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      source<span class="token punctuation">.</span><span class="token function">cancel</span><span class="token punctuation">(</span><span class="token string">'Operation has been canceled.'</span><span class="token punctuation">)</span>

      <span class="token keyword">return</span> axios
        <span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
          cancelToken<span class="token operator">:</span> source<span class="token punctuation">.</span>token
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span>reason <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
          <span class="token function">expect</span><span class="token punctuation">(</span>reason<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span>expect<span class="token punctuation">.</span><span class="token function">any</span><span class="token punctuation">(</span>Cancel<span class="token punctuation">)</span><span class="token punctuation">)</span>
          <span class="token function">expect</span><span class="token punctuation">(</span>reason<span class="token punctuation">.</span>message<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'Operation has been canceled.'</span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'when called after request has been sent'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should rejects Promise with a Cancel object'</span><span class="token punctuation">,</span> done <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> source <span class="token operator">=</span> CancelToken<span class="token punctuation">.</span><span class="token function">source</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      axios
        <span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">'/foo/bar'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
          cancelToken<span class="token operator">:</span> source<span class="token punctuation">.</span>token
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span>reason <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
          <span class="token function">expect</span><span class="token punctuation">(</span>reason<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toEqual</span><span class="token punctuation">(</span>expect<span class="token punctuation">.</span><span class="token function">any</span><span class="token punctuation">(</span>Cancel<span class="token punctuation">)</span><span class="token punctuation">)</span>
          <span class="token function">expect</span><span class="token punctuation">(</span>reason<span class="token punctuation">.</span>message<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'Operation has been canceled.'</span><span class="token punctuation">)</span>
          <span class="token function">done</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>

      <span class="token function">getAjaxRequest</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span>request <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        source<span class="token punctuation">.</span><span class="token function">cancel</span><span class="token punctuation">(</span><span class="token string">'Operation has been canceled.'</span><span class="token punctuation">)</span>
        <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
          request<span class="token punctuation">.</span><span class="token function">respondWith</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
            status<span class="token operator">:</span> <span class="token number">200</span><span class="token punctuation">,</span>
            responseText<span class="token operator">:</span> <span class="token string">'OK'</span>
          <span class="token punctuation">}</span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span><span class="token punctuation">,</span> <span class="token number">100</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>

    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'calls abort on request object'</span><span class="token punctuation">,</span> done <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> source <span class="token operator">=</span> CancelToken<span class="token punctuation">.</span><span class="token function">source</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      <span class="token keyword">let</span> request<span class="token operator">:</span> <span class="token builtin">any</span>
      axios
        <span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">'/foo/bar'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
          cancelToken<span class="token operator">:</span> source<span class="token punctuation">.</span>token
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">catch</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
          <span class="token function">expect</span><span class="token punctuation">(</span>request<span class="token punctuation">.</span>statusText<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toBe</span><span class="token punctuation">(</span><span class="token string">'abort'</span><span class="token punctuation">)</span>
          <span class="token function">done</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>

      <span class="token function">getAjaxRequest</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span>req <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        source<span class="token punctuation">.</span><span class="token function">cancel</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
        request <span class="token operator">=</span> req
      <span class="token punctuation">}</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>

  <span class="token function">describe</span><span class="token punctuation">(</span><span class="token string">'when called after response has been received'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token function">test</span><span class="token punctuation">(</span><span class="token string">'should not cause unhandled rejection'</span><span class="token punctuation">,</span> done <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
      <span class="token keyword">const</span> source <span class="token operator">=</span> CancelToken<span class="token punctuation">.</span><span class="token function">source</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
      axios
        <span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span><span class="token string">'/foo'</span><span class="token punctuation">,</span> <span class="token punctuation">{</span>
          cancelToken<span class="token operator">:</span> source<span class="token punctuation">.</span>token
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
        <span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
          window<span class="token punctuation">.</span><span class="token function">addEventListener</span><span class="token punctuation">(</span><span class="token string">'unhandledrejection'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
            done<span class="token punctuation">.</span><span class="token function">fail</span><span class="token punctuation">(</span><span class="token string">'Unhandled rejection.'</span><span class="token punctuation">)</span>
          <span class="token punctuation">}</span><span class="token punctuation">)</span>
          source<span class="token punctuation">.</span><span class="token function">cancel</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
          <span class="token function">setTimeout</span><span class="token punctuation">(</span>done<span class="token punctuation">,</span> <span class="token number">100</span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>

      <span class="token function">getAjaxRequest</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">then</span><span class="token punctuation">(</span>request <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
        request<span class="token punctuation">.</span><span class="token function">respondWith</span><span class="token punctuation">(</span><span class="token punctuation">{</span>
          status<span class="token operator">:</span> <span class="token number">200</span><span class="token punctuation">,</span>
          responseText<span class="token operator">:</span> <span class="token string">'OK'</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span>
      <span class="token punctuation">}</span><span class="token punctuation">)</span>
    <span class="token punctuation">}</span><span class="token punctuation">)</span>
  <span class="token punctuation">}</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br><span class="line-number">53</span><br><span class="line-number">54</span><br><span class="line-number">55</span><br><span class="line-number">56</span><br><span class="line-number">57</span><br><span class="line-number">58</span><br><span class="line-number">59</span><br><span class="line-number">60</span><br><span class="line-number">61</span><br><span class="line-number">62</span><br><span class="line-number">63</span><br><span class="line-number">64</span><br><span class="line-number">65</span><br><span class="line-number">66</span><br><span class="line-number">67</span><br><span class="line-number">68</span><br><span class="line-number">69</span><br><span class="line-number">70</span><br><span class="line-number">71</span><br><span class="line-number">72</span><br><span class="line-number">73</span><br><span class="line-number">74</span><br><span class="line-number">75</span><br><span class="line-number">76</span><br><span class="line-number">77</span><br><span class="line-number">78</span><br><span class="line-number">79</span><br><span class="line-number">80</span><br><span class="line-number">81</span><br><span class="line-number">82</span><br><span class="line-number">83</span><br><span class="line-number">84</span><br><span class="line-number">85</span><br><span class="line-number">86</span><br><span class="line-number">87</span><br><span class="line-number">88</span><br><span class="line-number">89</span><br><span class="line-number">90</span><br><span class="line-number">91</span><br><span class="line-number">92</span><br><span class="line-number">93</span><br><span class="line-number">94</span><br><span class="line-number">95</span><br><span class="line-number">96</span><br><span class="line-number">97</span><br><span class="line-number">98</span><br></div></div><p>注意这里我们使用了 <code>done.fail</code> 表示了一个异常的结束，这个并未在 Jest 文档中体现，但它是一个可以用的 API。</p> <p>至此，我们完成了取消模块相关业务逻辑的单元测试，我们测试覆盖率达到了阈值，测试已经通过了。但是扔未达到我们的目标，还有很多 feature 是没有覆盖到的。接下来我们就完成剩余 feature 的编写单元测试。</p></div></div> <div class="page-slot page-slot-bottom"><!-- 横向自适应 -->
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